itch.io

Yes it does, but some people are still confused. So here's a timeline:

- Adastra first

(DURING Adastra, Interea,  focusing on some events happening in Adastra)

and 2.5 years AFTER the end of Adastra and BEFORE the 8 years, Khemia

Not exactly,  Khemia takes place ~2.5 years after Marco return to Earth to do his 8 year mission.

Interea is very useful in that as well as telling the story of the wolven moon tour, it's providing historical background to the Khemia story and it's characters (Brunis for example).